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26 articles

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Apr 20, 2026 · Information Security

Is Cisco Facing an Epic Leak Crisis? The Triple Threat of Supply Chain, Source Code, and Keys

A high‑risk incident reported by ShinyHunters claims Cisco’s core source code, private keys, API tokens, AWS bucket rights, GitHub repositories, and millions of Salesforce records are being sold for $210,000, highlighting how simultaneous exposure of code and credentials can turn a data breach into an ecosystem‑wide compromise.

CiscoPrivate keysSupply Chain

0 likes · 5 min read

Is Cisco Facing an Epic Leak Crisis? The Triple Threat of Supply Chain, Source Code, and Keys

Black & White Path

Apr 17, 2026 · Information Security

Why US‑Made Network Gear Crashed During the Isfahan Attack: Four Possible Digital Kill‑Switch Scenarios

During the April 2026 US‑Israel strike on Iran's Isfahan province, Cisco, Fortinet, and Juniper devices abruptly failed, prompting analysts to propose four precise, non‑network‑dependent attack methods ranging from hidden backdoors to supply‑chain tampering and to warn of a new era of digital‑focused warfare.

CiscoCyberattackDigital Warfare

0 likes · 5 min read

Why US‑Made Network Gear Crashed During the Isfahan Attack: Four Possible Digital Kill‑Switch Scenarios

Black & White Path

Apr 3, 2026 · Information Security

Cisco Faces New Data Breach Ultimatum After ShinyHunters Exposes FBI, NASA Records

In March 2026, the ShinyHunters ransomware group claimed to have breached Cisco's Salesforce CRM, GitHub repositories, and AWS S3 buckets, stealing over 3 million records that include personnel data from U.S. agencies such as the FBI, DHS, IRS, NASA, as well as Australian and Indian government entities, and issued an ultimatum for Cisco to respond by April 3.

AWSCiscoOAuth

0 likes · 9 min read

Cisco Faces New Data Breach Ultimatum After ShinyHunters Exposes FBI, NASA Records

Linux Code Review Hub

Feb 27, 2024 · Fundamentals

How to Compute Headroom for Lossless Ethernet Links (Part 2)

This section analytically derives the headroom size for loss‑less Ethernet links using IEEE 802.1Qbb priority flow control, detailing worst‑case delays, interface and cable latency, buffer cell sizing, Cisco Nexus configuration examples, and a comparison with Fibre Channel B2B primitives.

BuffersCiscoDataCenter

0 likes · 22 min read

How to Compute Headroom for Lossless Ethernet Links (Part 2)

21CTO

Sep 12, 2023 · Information Security

BroadWorks Auth Bypass (CVE-2023-20238) & RADIUS DoS (CVE-2023-20243) Alerts

Cisco has issued six security advisories, including a critical authentication bypass vulnerability in its BroadWorks Application Delivery and Extension Service Platform (CVE‑2023‑20238) and a high‑severity RADIUS denial‑of‑service flaw in its Identity Services Engine (CVE‑2023‑20243), with CISA also issuing alerts and urging users to review and mitigate the issues.

Authentication BypassCVE-2023-20238CVE-2023-20243

0 likes · 2 min read

BroadWorks Auth Bypass (CVE-2023-20238) & RADIUS DoS (CVE-2023-20243) Alerts

Open Source Linux

May 23, 2023 · Fundamentals

Hands‑On OSPF Lab: Configuring Huawei, Cisco, and Juniper Networks

This article provides step‑by‑step OSPF lab exercises for Huawei, Cisco, and Juniper devices, covering basic OSPF concepts, configuration guidelines, verification commands, and troubleshooting tips, enabling readers to build and test a multi‑vendor OSPF network topology.

CiscoHuaweiJuniper

0 likes · 23 min read

Hands‑On OSPF Lab: Configuring Huawei, Cisco, and Juniper Networks

Qunar Tech Salon

Mar 10, 2022 · Operations

Design and Implementation of Cisco Nexus VPC for Qunar K8S Network

This article details the background, design rationale, network topology changes, and step‑by‑step procedures—including VPC configuration, BGP setup, and port‑channel adjustments—used to upgrade Qunar's data‑center network for Kubernetes deployments, with practical code examples and operational tips.

BGPCiscoDataCenter

0 likes · 11 min read

Design and Implementation of Cisco Nexus VPC for Qunar K8S Network

Qunar Tech Salon

Jun 22, 2021 · Operations

Troubleshooting BFD Neighbor Failure on Cisco Nexus Switches with VPC Peer‑Gateway

This article details a Cisco Nexus network scenario where two switches use VPC and BFD for link fault detection, explains why BFD neighbor establishment fails due to VPC peer‑gateway causing TTL reduction and MAC rewriting, and presents test results and configuration recommendations to resolve the issue.

BFDCiscoHSRP

0 likes · 10 min read

Troubleshooting BFD Neighbor Failure on Cisco Nexus Switches with VPC Peer‑Gateway

Architects' Tech Alliance

Jun 20, 2021 · Fundamentals

Mastering Cisco Routing: When to Use Multiple Protocols, Access Lists, and Redistribution

This comprehensive guide explains when to employ multiple routing protocols, compares distance‑vector and link‑state routing, details access‑list types and creation commands, outlines route redistribution steps and commands, clarifies administrative distance, BGP fundamentals, metric concepts, and provides hardware compatibility notes for Cisco routers and switches.

BGPCiscoNetworking

0 likes · 26 min read

Mastering Cisco Routing: When to Use Multiple Protocols, Access Lists, and Redistribution

Programmer DD

Aug 30, 2020 · Information Security

How a Former Cisco Engineer Sabotaged Cloud Infrastructure and What It Means for Security

A former Cisco employee, Sudhish Kasaba Ramesh, pleaded guilty to illegally accessing Cisco’s AWS‑hosted cloud infrastructure, deploying code that deleted 456 WebEx Teams virtual machines, shutting down over 16,000 accounts, costing the company millions in recovery and refunds, while avoiding data leakage.

CiscoWebEx Teamscloud security

0 likes · 4 min read

How a Former Cisco Engineer Sabotaged Cloud Infrastructure and What It Means for Security

Architects Research Society

Jun 8, 2020 · Operations

Data Center Structure Management and Automation with Cisco DCNM and Spine‑Leaf Architectures

This article explains various Cisco tools and architectures for data‑center structure management and automation, including Cisco Data Center Network Manager modes, Network Insights applications, and a detailed comparison of FabricPath, VXLAN flood‑and‑learn, VXLAN MP‑BGP EVPN, and MSDC Layer 3 spine‑leaf designs.

CiscoDCNMSpine‑Leaf

0 likes · 16 min read

Data Center Structure Management and Automation with Cisco DCNM and Spine‑Leaf Architectures

Architects Research Society

Jun 6, 2020 · Cloud Computing

Cisco VXLAN Flood and Learn Spine‑and‑Leaf Network Overview

This article explains Cisco's VXLAN flood‑and‑learn spine‑and‑leaf architecture, covering its standards compliance, encapsulation format, underlay and overlay network design, multicast and ingress replication, host discovery, routing, and multi‑tenant support for both Layer 2 and Layer 3 environments.

CiscoNetwork VirtualizationOverlay Network

0 likes · 11 min read

Cisco VXLAN Flood and Learn Spine‑and‑Leaf Network Overview

Architects Research Society

Jun 5, 2020 · Operations

Cisco FabricPath Spine‑and‑Leaf Network Architecture Overview

The article provides a comprehensive technical overview of Cisco's FabricPath spine‑and‑leaf network, detailing its encapsulation, control plane, broadcast handling, host discovery, multicast support, layer‑3 routing options, multitenancy features, and hardware requirements.

CiscoFabricPathLayer2

0 likes · 12 min read

Cisco FabricPath Spine‑and‑Leaf Network Architecture Overview

Architects Research Society

Jun 4, 2020 · Cloud Computing

Network Overlay Technologies for Modern Virtualized Data Center Architectures

The article explains the requirements of modern virtualized data‑center structures, describes network overlay concepts and formats such as VXLAN, NVGRE, TRILL and LISP, outlines their benefits like optimized device functions, scalability and overlapping addressing, and reviews Cisco's spine‑and‑leaf designs that meet these needs.

CiscoNetwork OverlayVXLAN

0 likes · 5 min read

Network Overlay Technologies for Modern Virtualized Data Center Architectures

Architects Research Society

May 29, 2020 · Cloud Computing

Series: Cisco Data Center Spine and Leaf Architecture – Design Overview Whitepaper

This article explains Cisco's evolution from traditional three‑tier data center designs to modern spine‑and‑leaf and Clos network architectures, highlighting the limitations of STP, the introduction of vPC, and the benefits of virtualization for high‑bandwidth, low‑latency server connectivity.

CiscoClos NetworkSpine-and-Leaf

0 likes · 7 min read

Series: Cisco Data Center Spine and Leaf Architecture – Design Overview Whitepaper

Architects' Tech Alliance

Sep 19, 2019 · Industry Insights

Why 400G Optical Modules Are Poised to Transform Data Centers

The article analyzes the rapid growth of 400G optical modules, comparing OSFP and QSFP‑DD form factors, detailing Cisco's new Nexus 400G switch lineup and Broadcom's BCM87400 PAM‑4 PHY, and explains how these technologies are set to meet expanding data‑center bandwidth demands while highlighting market adoption trends and potential cost trade‑offs.

400GBroadcomCisco

0 likes · 16 min read

Why 400G Optical Modules Are Poised to Transform Data Centers

DevOps Cloud Academy

Aug 9, 2019 · Operations

Static Routing Configuration and Verification on Cisco Routers

This guide explains the concepts of routing tables, static and default routes, and provides step‑by‑step Cisco router configuration commands and verification procedures to achieve full network connectivity between two routers and their attached PCs.

CiscoIP routingRouter configuration

0 likes · 4 min read

Static Routing Configuration and Verification on Cisco Routers

DevOps Cloud Academy

Aug 9, 2019 · Operations

Guide to Cisco Switch Configuration Commands and Modes

This article explains the different Cisco device configuration modes—user, privileged, global, and interface—provides command examples for setting hostnames, viewing version and MAC tables, and configuring duplex and speed settings on switch ports, illustrated with screenshots.

CLICiscoDuplex

0 likes · 3 min read

Guide to Cisco Switch Configuration Commands and Modes

Practical DevOps Architecture

Jul 25, 2019 · Information Security

Configuring an IPSec VPN Between Huawei and Cisco Routers Using Virtual Tunnel Interfaces

This guide explains the security risks of transparent Internet data transmission, introduces IPSec's authentication, encryption, integrity, and anti‑replay features, and provides step‑by‑step Huawei and Cisco router configurations—including interface setup, IKE proposals, IPSec profiles, and verification commands—to securely connect branch and headquarters networks via a VPN.

CiscoHuaweiIPSec

0 likes · 13 min read

Configuring an IPSec VPN Between Huawei and Cisco Routers Using Virtual Tunnel Interfaces

Architects' Tech Alliance

Nov 7, 2018 · Fundamentals

Survey of Network Types and Vendors in High‑Performance Computing (HPC) Environments

The Intersect360 2016 survey of 474 HPC sites covering 723 compute systems, 633 storage systems and 638 LANs reveals that Ethernet and InfiniBand dominate system interconnect, storage and LAN networks, with Mellanox and Cisco accounting for over half of installations, while newer technologies such as 10 GE, 40 G, 56 G InfiniBand and Omni‑Path show evolving market shares driven by bandwidth and latency demands.

CiscoHPCInfiniBand

0 likes · 10 min read

Survey of Network Types and Vendors in High‑Performance Computing (HPC) Environments

Practical DevOps Architecture

Dec 8, 2015 · Operations

Configuring a Cisco 3560G Layer 3 Switch for Dual Internet Access with VLANs, ACLs, and Policy Routing

This guide details how to set up a Cisco 3560G three‑layer switch to support two groups with separate internet exits by defining VLANs, assigning IP addresses, creating ACLs, configuring route‑maps, and applying policy routing to direct traffic through the appropriate upstream routers.

ACLCiscoNetwork Configuration

0 likes · 7 min read

Configuring a Cisco 3560G Layer 3 Switch for Dual Internet Access with VLANs, ACLs, and Policy Routing

Practical DevOps Architecture

Nov 27, 2015 · Information Security

Configuring Cisco Router Interfaces and Access Lists

This guide demonstrates how to configure FastEthernet interfaces on a Cisco router, assign IP addresses, create and apply a standard access list to block a specific host, and verify the access list entries using show commands.

Access ListCiscoNetwork Configuration

0 likes · 3 min read

Configuring Cisco Router Interfaces and Access Lists

Practical DevOps Architecture

Nov 16, 2015 · Fundamentals

Configuring Router Interface IP and DHCP Settings

This guide explains how to configure a router’s FastEthernet interface with a static IP address, enable DHCP services, set address exclusions, and configure a host to obtain its IP settings automatically, using Cisco IOS command-line syntax.

CiscoDHCPIP Configuration

0 likes · 2 min read

Configuring Router Interface IP and DHCP Settings

Practical DevOps Architecture

Nov 10, 2015 · Fundamentals

Configuring VLANs, Trunk Ports, and EtherChannel on Cisco Switches

This guide demonstrates how to create VLANs, assign them to interface ranges, configure trunk ports, and set up EtherChannel for redundant parallel connections on Cisco switches using CLI commands.

CiscoEtherChannelNetwork Configuration

0 likes · 3 min read

Configuring VLANs, Trunk Ports, and EtherChannel on Cisco Switches

Practical DevOps Architecture

Nov 4, 2015 · Operations

Configuring Interfaces and Static Routes on Cisco Routers (R1, R2, R3)

This guide demonstrates how to configure interfaces and static routes on three Cisco routers (R1, R2, R3) using CLI commands, assign IP addresses, enable interfaces, and verify the routing table, providing a step‑by‑step example of basic network routing setup.

Cisconetwork fundamentalsstatic routing

0 likes · 4 min read

Configuring Interfaces and Static Routes on Cisco Routers (R1, R2, R3)

Practical DevOps Architecture

May 28, 2015 · Operations

10 Cisco IOS Service Subcommands and Their Usage

This article lists and explains ten Cisco IOS service subcommands—including service dhcp, service linenumber, service password-encryption, service nagle, and others—detailing their functions, typical usage scenarios, and security considerations for configuring routers and switches.

CiscoRouter configurationiOS

0 likes · 6 min read

10 Cisco IOS Service Subcommands and Their Usage